package cn._2dland.tools;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class RefererFilter implements Filter {
	public void init(FilterConfig config) throws ServletException {
	}

	public void destroy() {
	}

	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest httpReq = (HttpServletRequest)req;
		HttpServletResponse httpResp = (HttpServletResponse)resp;
		String referer = httpReq.getHeader("Referer");
		String regex = "^http://www\\.2dland\\.cn/watch/.*$";

		if(referer == null || referer.matches(regex))
			chain.doFilter(req, resp);
		else
			httpResp.sendError(HttpServletResponse.SC_INTERNAL_SERVER_ERROR);
	}
}
